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1 perry 1 tclsh
2 !!!tclsh
3 NAME
4 SYNOPSIS
5 DESCRIPTION
6 SCRIPT FILES
7 VARIABLES
8 PROMPTS
9 KEYWORDS
10 ----
11 !!NAME
12
13
14 tclsh - Simple shell containing Tcl interpreter
15 !!SYNOPSIS
16
17
18 __tclsh__ ?''fileName arg arg ...''?
19
20
21 ________________________________________________________________________________________________________________________________________
22 !!DESCRIPTION
23
24
25 __Tclsh__ is a shell-like application that reads Tcl
26 commands from its standard input or from a file and
27 evaluates them. If invoked with no arguments then it runs
28 interactively, reading Tcl commands from standard input and
29 printing command results and error messages to standard
30 output. It runs until the __exit__ command is invoked or
31 until it reaches end-of-file on its standard input. If there
32 exists a file __.tclshrc__ (or __tclshrc.tcl__ on the
33 Windows platforms) in the home directory of the user,
34 __tclsh__ evaluates the file as a Tcl script just before
35 reading the first command from standard input.
36 !!SCRIPT FILES
37
38
39 If __tclsh__ is invoked with arguments then the first
40 argument is the name of a script file and any additional
41 arguments are made available to the script as variables (see
42 below). Instead of reading commands from standard input
43 __tclsh__ will read Tcl commands from the named file;
44 __tclsh__ will exit when it reaches the end of the file.
45 There is no automatic evaluation of __.tclshrc__ in this
46 case, but the script file can always __source__ it if
47 desired.
48
49
50 If you create a Tcl script in a file whose first line
51 is
52
53
54 __#!/usr/local/bin/tclsh
55 __
56
57
58 then you can invoke the script file directly from your shell
59 if you mark the file as executable. This assumes that
60 __tclsh__ has been installed in the default location in
61 /usr/local/bin; if it's installed somewhere else then you'll
62 have to modify the above line to match. Many UNIX systems do
63 not allow the __#!__ line to exceed about 30 characters
64 in length, so be sure that the __tclsh__ executable can
65 be accessed with a short file name.
66
67
68 An even better approach is to start your script files with
69 the following three lines:
70
71
72 __#!/bin/sh
73 # the next line restarts using tclsh \
74 exec tclsh
75 __
76
77
78 This approach has three advantages over the approach in the
79 previous paragraph. First, the location of the __tclsh__
80 binary doesn't have to be hard-wired into the script: it can
81 be anywhere in your shell search path. Second, it gets
82 around the 30-character file name limit in the previous
83 approach. Third, this approach will work even if
84 __tclsh__ is itself a shell script (this is done on some
85 systems in order to handle multiple architectures or
86 operating systems: the __tclsh__ script selects one of
87 several binaries to run). The three lines cause both
88 __sh__ and __tclsh__ to process the script, but the
89 __exec__ is only executed by __sh__. __sh__
90 processes the script first; it treats the second line as a
91 comment and executes the third line. The __exec__
92 statement cause the shell to stop processing and instead to
93 start up __tclsh__ to reprocess the entire script. When
94 __tclsh__ starts up, it treats all three lines as
95 comments, since the backslash at the end of the second line
96 causes the third line to be treated as part of the comment
97 on the second line.
98 !!VARIABLES
99
100
101 __Tclsh__ sets the following Tcl variables:
102
103
104 __argc__ Contains a count of the number of ''arg''
105 arguments (0 if none), not including the name of the script
106 file.
107
108
109 __argv__ Contains a Tcl list whose elements are the
110 ''arg'' arguments, in order, or an empty string if there
111 are no ''arg'' arguments.
112
113
114 __argv0__ Contains ''fileName'' if it was specified.
115 Otherwise, contains the name by which __tclsh__ was
116 invoked.
117
118
119 __tcl_interactive__
120
121
122 Contains 1 if __tclsh__ is running interactively (no
123 ''fileName'' was specified and standard input is a
124 terminal-like device), 0 otherwise.
125 !!PROMPTS
126
127
128 When __tclsh__ is invoked interactively it normally
129 prompts for each command with ``__%__ ''. You can change
130 the prompt by setting the variables __tcl_prompt1__ and
131 __tcl_prompt2__. If variable __tcl_prompt1__ exists
132 then it must consist of a Tcl script to output a prompt;
133 instead of outputting a prompt __tclsh__ will evaluate
134 the script in __tcl_prompt1__. The variable
135 __tcl_prompt2__ is used in a similar way when a newline
136 is typed but the current command isn't yet complete; if
137 __tcl_prompt2__ isn't set then no prompt is output for
138 incomplete commands.
139 !!KEYWORDS
140
141
142 argument, interpreter, prompt, script file,
143 shell
144 ----
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